29121245891 has 2 divisors, whose sum is σ = 29121245892. Its totient is φ = 29121245890.

The previous prime is 29121245861. The next prime is 29121245927. The reversal of 29121245891 is 19854212192.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29121245891 is a prime.

It is not a weakly prime, because it can be changed into another prime (29121245861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14560622945 + 14560622946.

It is an arithmetic number, because the mean of its divisors is an integer number (14560622946).

Almost surely, 2^29121245891 is an apocalyptic number.

29121245891 is a deficient number, since it is larger than the sum of its proper divisors (1).

29121245891 is an equidigital number, since it uses as much as digits as its factorization.

29121245891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 44.

The spelling of 29121245891 in words is "twenty-nine billion, one hundred twenty-one million, two hundred forty-five thousand, eight hundred ninety-one".